The contract is not to sue him, but if he would not follow through to put in front of his face and be able to walk away. It's as much for them to stick to as him.
And I may be wrong about the sober living places, but it was my thinking that you do have to pay to be there. And, the point is that there is a beginning, a plan, and an end. If they will simply agree to give him X amount per month forever more he would not have the accountability of a sober house who will have strict rules, nor the incentive to support himself.
Just my .02